The CR45 can be used as a portable dual filtration kit prior water entering the entire system of the van. This then filters water prior filling water tanks to minimise sediment build up, and also filters the mains pressure line to assist with sediment protection of the water pumps and hot water system.
These are generally used in conjunction with a filter under bech just prior the drinking tap for utmost peace of mind! 
An Australia Post tracking number is provided, along with receipt & a pic of addressed package prior lodging at Post Office, generally each business day.